Thriller starring Sandra Bullock and George Clooney had its worldwide premiere at the Venice Film Festival.

Critics attending the premiere of director Alfonso Cuarón's new film "Gravity" are reacting with wild enthusiasm - with many calling it a groundbreaking cinematic experience filled with tension and surprises.

"It falls among that increasingly rare breed of popular entertainments capable of prompting genuine 'How did they do that?' reactions from even the most jaded viewers, even as its central premise is so simple and immediately gripping that one might just as readily ask, 'Why didn’t anyone do it sooner?,' writes Justin Chang for Variety.

If you've yet to see the trailer (see below), the plot for "Gravity" revolves around a medical engineer (Sandra Bullock) and an astronaut (George Clooney) who work together to survive a terrifying accident in space. At one point, Bullock's character is cut from her umbilical cord and drifts into the blackness of oblivion - a moment that inspires genuine fear and helplessness.

"With nothingness pressing in on all sides, in a place where the grip of someone else’s hand is all that keeps you from the void, life really does seem like a miracle," writes Robbie Collin for The UK Telegraph.

What does all of this positivity currently add up to on Rotten Tomatoes? A perfect 100% approval rating. Let's see if Cuarón can keep it up going into "Gravity's" October 4th theatrical release. Check out a trailer below.